/*
  Blink
  Turns on an LED on for one second, then off for one second, repeatedly.
 
  This example code is in the public domain.
 */
#define _WAIT delay(50)
#define _WAIT2 delay(100)


void setup() {                
  // initialize the digital pin as an output.
  // Pin 13 has an LED connected on most Arduino boards:
  pinMode(13, OUTPUT);     
}

void loop() {
  digitalWrite(13,HIGH);
  _WAIT;
  digitalWrite(13,LOW);
  _WAIT2;
  
}
